Download MBBS Anatomy PPT 7 Autonomic Nervous System Notes

Download MBBS (Bachelor of Medicine, Bachelor of Surgery) Human Anatomy ppt lectures Topic 7 Autonomic Nervous System Notes. - anatomy ppt free download human anatomy ppt lectures, medicine notes ppt, anatomy handwritten notes pdf, mbbs 1st year anatomy notes pdf download, best anatomy notes pdf, human anatomy notes pdf, anatomy easy notes pdf, anatomy notes online, anatomy short notes, Anatomy ppt, Powerpoint Presentations and lecture notes.


Autonomic Nervous System

? A. Comparison of somatic and autonomic

nervous systems

? B. Anatomy of autonomic motor pathways

1. Overview

a. Preganglionic neurons
b. Autonomic ganglia
c. Postganglionic neurons

? C. Physiological effects of ANS

1. ANS neurotransmitters
2. Parasympathetic and sympathetic

responses

ANS regulates activities of cardiac muscle, smooth
muscle, and glands.

?Structurally, ANS consists of two main components:

1. visceral afferent neurons

2. visceral efferent neurons

?Functionally, the ANS operates:

1. without conscious control

2. reflex arc dependent

3. medulla and hypothalamus over ride


Somatic & Autonomic Nervous Systems

Somatic

Autonomic

cutaneous receptors chemoreceptors
proprioceptors baroreceptors
special senses mechanoreceptors

may become conscious unconscious

excitatory for skeletal excitatory or inhibitory for
muscles cardiac muscle, smooth

muscles, and glands

single motor neuron two motor neurons

Somatic and Autonomic Efferent Pathways
Overview of Autonomic Pathways
?Preganglionic neuron

?1. first of two autonomic motor neurons

?2. cell body located in gray matter of spinal

cord (lateral column) or brain

?Thoraco lumbar ? sympathetic & Craniosacral

?parasympathetic

?3. preganglionic axon passes from CNS in a

spinal or cranial nerve

?4. axon terminates in a ganglion

Overview of Autonomic Pathways

?Ganglion

?1. collection of nerve cell bodies located in

a specific site outside CNS

?2. cell bodies give rise to postganglionic

neurons


Overview of Autonomic Pathways

?Postganglionic neuron

?1. second of two autonomic motor neurons

?2. cell body located in ganglion

?3. postganglionic axon passes from ganglion

to effector Organ

?4. peripheral effector is either stimulated or

inhibited


Sympathetic Nervous System

?1. lateral gray horns (T1-L2)
?2. Thoracolumbar outflow

?3. ganglia

a. sympathetic trunk (paravertebral)

b. Prevertebral (collateral)

?4. preganglionic axons short

?5. postganglionic axons long

Sympathetic Nervous System


Parasympathetic Nervous System

?1. lateral gray horns (S2-4)

?2. cranial gray matter

(III, VII, IX, X)

?3. Craniosacral outflow

?4. terminal ganglia

?5. preganglionic axons long

?6. postganglionic axons short

Parasympathetic Nervous System


Physiological Effects of ANS

? 1. dual (duel?) innervation
? 2. different neurotransmitters
? 3. parasympathetic tone

ANS Neurotransmitters

Cholinergic

Adrenergic

acetylcholine

norepinephrine

all preganglionic neurons

most postganglionic

all postganglionic parasympathetic & sympathetic neurons
few postganglionic sympathetic neurons

acetylcholinesterase

catechol-O-methyl

transferase

monoamine oxidase


Autonomic Nervous System - Neurotransmitters &
Receptors ? Sympathetic arm

Autonomic Nervous System - Neurotransmitters &
Receptors ? Parasympathetic arm
Sympathetic System

?1. energy expenditure system

?2. fight-or-flight response

?3. dominates parasympathetic NS

?4. effects

Parasympathetic System

?1. energy conservation-restoration

system

?2. rest-and-recovery

?3. dominates sympathetic NS



This post was last modified on 05 April 2022